Carbide Tipped Adjustable Drill Countersinks are designed to cut bevels in wood and plastic for wood screw heads #4 to #10.
They attach to the drill with two set screws and can be adjusted up and down the drill for any length from a #4 to a #10 wood screw.

Drill Countersinks are designed to cut bevels in wood and plastic for wood screw heads.
They attach to the drill with two set screws and can be adjusted up and down the drill for any length of wood screw.
All Drill Countersinks have 4 flutes.

Plain Type High Speed Steel Combined Drill and Countersinks are
designed to produce accurate center holes in components which require
machining between centers. Sizes #0 to #000 are often referred
to as Missile & Aircraft series.

Left Hand Plain Type High Speed Steel Combined Drill and Countersinks are
designed to produce accurate center holes in components which require
machining between centers. Sizes #0 to #000 are often referred
to as Missile & Aircraft series.

Plain Type M42 Cobalt Combined Drill and Countersinks are designed
to produce accurate center holes in components which require machining
between centers. Sizes #0 to #000 are often referred to as Missile & Aircraft
series.

Plain Type Solid Carbide Combined Drill and Countersinks are designed
to produce accurate center holes in components which require machining
between centers. Sizes #0 to #000 are often referred to as Missile & Aircraft
series.

Zero Flute Countersinks are designed for countersinking and deburring operations.
The single cutting edge removes stock quickly and prevents chatter. They
can be resharpened by using an Axial Relieving Fixture or by using a small mounted
grinding wheel and inserting it into the hole.

Single Flute Countersinks should be used when multi-flute countersinks chatter
or the hole is too small for a multi-flute countersink to enter. Use for machine
and portable work when operating at higher speeds. Drilled hold should be at
least 10% of the diameter of the countersink.

Three Flute Countersinks should be used at a slower (1/2 to 2/3 the speed used
for drilling) speed. Recommended for machine and portable work. Because of their
centering ability they are widely used in portable applications.